Davids, N., M. Hoffmann, N. Naidoo, T. Manjati, and R. T. Erasmus. “Are We Appropriately Testing for Vitamin B12 and Folate Deficiency?”. Annals of Clinical Chemistry and Laboratory Medicine, vol. 3, no. 1, Jan. 2018, pp. 8-14, doi:10.3126/acclm.v3i1.15612.